#include <Servo.h>
#include <NewPing.h>
NewPing sensor (3,2,30);
Servo servo;
int jarak;
void setup() {
  // put your setup code here, to run once:
  servo.attach(13);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  jarak = sensor.ping_cm();
  if(jarak<=20 && jarak >=1){
    servo.write(0);
  }
  else if (jarak==0 || jarak>=21){
    servo.write(90);
  }
  Serial.println(jarak);
  delay(1000);
}